Has anyone wired their 20" light bar, or whatever, to their fog light wiring by adding an aftermarket bumper and taking out the fog lights and installing the light bar? If so, how? Thanks!
Has anyone wired their LED light bar to their fog light switch?
Hbrown
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no my question is how did they wire it.
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I did. I wired my fog light circuit to switch a relay that switches power in a fused wire between my battery and my bumper lights. In other words, my bumper lights are powered directly from the battery, but turn on and off with the fog light switch. It was pretty straight forward. I found both the relay and the fuse at the auto parts store, and mounted the relay and a fuse under the hood near the battery.
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188 Posts
Do you have pictures by chance?
Google Headlight revolution for a plug n play. 2504 male lamp circuit goes into the OEM 's bulb 2504 and the other side of the pigtail uses whatever connector to your lights. You get a pair so each light has its plug and the fog light switch operates them. Anthony at Headlight Revolution will explain everything to you.
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Oh, I'm sorry man. You're absolutely right. I took out the fog lights and wired a 20" light bar to the fog light wiring while adding an aftermarket bumper and taking out the fog lights.
Something like that.
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Like g_force stated, you can wire it to a relay exactly as you would with any other switch but replacing said switch with a connection to one of the fog light harnesses.
If you order these, you don't need to splice your factory wiring at all. Cut the wires off one and plug the vehicle-side connector to protect from the elements.
Wire the other one to the relay by connecting to the wires as if it were the switch...
![Image]()
I used a similar relay, as linked below, in my aux light install, works just fine. The third wire to the switch provides power to the "ready" light on the switch so it is irrelevant to your install. I think it was the white one, but don't recall. Either trial/error or do voltmeter readings with the included switch to see which wires are hot when the switch is off/on (the hot one in off position is discarded) and the other one will be ground.
http://amzn.com/B00JB69438
The wiring in this vehicle is odd so it may be that both foglight leads will need to drive the relay, but I'm not sure if this is the case. Try with one before snipping the leads off the other pigtail.
If you order these, you don't need to splice your factory wiring at all. Cut the wires off one and plug the vehicle-side connector to protect from the elements.
Wire the other one to the relay by connecting to the wires as if it were the switch...
I used a similar relay, as linked below, in my aux light install, works just fine. The third wire to the switch provides power to the "ready" light on the switch so it is irrelevant to your install. I think it was the white one, but don't recall. Either trial/error or do voltmeter readings with the included switch to see which wires are hot when the switch is off/on (the hot one in off position is discarded) and the other one will be ground.
http://amzn.com/B00JB69438
The wiring in this vehicle is odd so it may be that both foglight leads will need to drive the relay, but I'm not sure if this is the case. Try with one before snipping the leads off the other pigtail.
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175 Posts
RapidDissent's figure pretty much shows how I wired mine. In his figure, the box between the on/off switch and the relay represents the OEM foglight leads. On your JK, there are two leads, one to the left light and one to the right. I only used one to trigger the relay.
BTW, I chose the relay route, in part, because I didn't know how much power the OEM wiring was designed to take.
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So is it possible to still run the fogs and just slice into one side of the harness, then relay, to add a small 10" led bar still using the fog switch to turn on both?
Technically yes......my only concern would be the amount of amps drawn...it probably wouldn't be too many. Wouldn't try that with a "conventional" aftermarket light. Thats the nice thing about LEDs low amp draw, and brighter light.
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That is what I did with mine. Running 9 Hella 500ff off the stock fogs through two relays.
I tapped the passenger side fog by skinning the wire insulation back 1/8" and soldering in a 16 gauge wire. I loomed this wire with the 10 ga positive and negative supply power to the front lights. The relays are located near the battery. The fog trigger wire triggers both relays. Power to the relays is supplied through two 8 ga ATO fuse holders. On the highway o leave the windshield bar fuse out and run just the four fronts.
I tapped the passenger side fog by skinning the wire insulation back 1/8" and soldering in a 16 gauge wire. I loomed this wire with the 10 ga positive and negative supply power to the front lights. The relays are located near the battery. The fog trigger wire triggers both relays. Power to the relays is supplied through two 8 ga ATO fuse holders. On the highway o leave the windshield bar fuse out and run just the four fronts.
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Something went wrong while I was trying to do the same, putting 20" led bar on bumper on my 2015 JKU. Skinned off driver side fog light wiring, tapped led bar wiring to it. It lit up for a second only, driver side fog light does not turn on anymore. Need help please!
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We're you running the light bar off the factory fog circuit or using the fog circuit as a relay trigger?
Check the fuse panel, sounds like you pulled too many amps and popped a fuse or fried a wire. Any magic smoke come out?
Check the fuse panel, sounds like you pulled too many amps and popped a fuse or fried a wire. Any magic smoke come out?
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392 Posts
Okay, did some quick digging.
No fuse in the fog system. Wires run directly to the PCM. If the computer detects an over current it shuts down that circuit.
You are pulling too many amps. Rewire using a relay and trigger off the factory fog circuit.
No fuse in the fog system. Wires run directly to the PCM. If the computer detects an over current it shuts down that circuit.
You are pulling too many amps. Rewire using a relay and trigger off the factory fog circuit.
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17 Posts
Thanks redneckdan, yes I tapped directly to the fog light circuitry...was apprehensive about that, but just wanted to mess with it.
Update : after battery reset, fog lights turned back on now.
I may have to buy a harness, relay, fuse and then tap onto fog light wiring to use them as a switch.
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392 Posts
Yes, that is exactly what I did.
I soldered an ATO fuse holder into a 40 amp relay holder. In this picture, yellow is positive to relay, red is positive from relay to lights, blue is relay ground and yellow is trigger.
Run the supple wires along the passenger side down to the front end. Connect your trigger wire where you already skinned the factory fog wire. Loom it with supply wires and run it up working the relay.
Run a dedicated ground, none of that ground to the frame bullshit. Can mess up vehicle electronics.
I soldered an ATO fuse holder into a 40 amp relay holder. In this picture, yellow is positive to relay, red is positive from relay to lights, blue is relay ground and yellow is trigger.
Run the supple wires along the passenger side down to the front end. Connect your trigger wire where you already skinned the factory fog wire. Loom it with supply wires and run it up working the relay.
Run a dedicated ground, none of that ground to the frame bullshit. Can mess up vehicle electronics.
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392 Posts
Use shrink tube and dielectric! Soldered not crimped!
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